Here are my lyrics files to many of the songs I teach in my class.

Juanes
Great with the irregular preterite
Great with reflexive verbs and present tense
Great with subjunctive
Great example of a political / "cause" song
Julieta Venegas
A great song to begin the year
Camila
Todo cambió por Camila.doc - Great song for the preterite
MIENTES por Camila.doc - 4 Time Latin Grammy nominees. The kids love this song.

Reik
Good beginning song! Happy and light.
Jennifer Peña
Good for object pronouns.
Nelly Furtado
Preterite, pronouns, and Juanes!
Amaral
A good review of all the tenses of the year; great upper level song.
Rigo Luna
Good with the imperfect.
Allison
Good beginning of the year song. Punk rock sound.
Cabas
Commands, very danceable song!
Jesse & Joy

Good with descriptions and adjectives. Happy song!
Pronouns, present tense, estar. Lighthearted love song the kids love!
Kalimba
R&B feel the kids love, good with stem changers and irregular verbs.
Selena
Simple commands, Who doesn't love Selena?